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copied!<p>You could do a simple check against key environment variables. No telling exactly how reliable this might be, though.</p> <pre><code>import os, logging try: os.environ['APPENGINE_RUNTIME'] except KeyError: logging.warn('We are not in App Engine environment') else: logging.info('We are in the App Engine environment') </code></pre> <p>You can also <a href="https://developers.google.com/appengine/docs/python/config/appconfig#Defining_Environment_Variables" rel="nofollow">define your own custom environment variable in your App Engine configuration file</a> and that will be viewable from <code>os.environ</code> within any module. So, type something like this in your app.yaml file:</p> <pre><code>env_variables: MY_APP_ENGINE_ENVIRONMENT: '982844ed9cbd6ce42318d2804386be29cbc7c35a' </code></pre> <p>... will give you an unambiguous ID to reference.</p> <p>From the development server, here are the environment variables that I get:</p> <pre><code>{'USER_EMAIL': '', 'DATACENTER': 'us1', 'wsgi.version': (1, 0), 'REQUEST_ID_HASH': 'E2C19D51', 'SERVER_NAME': 'mydesktop', 'QUERY_STRING': '', 'HTTP_ACCEPT': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8', 'APPENGINE_RUNTIME': 'python27', 'wsgi.input': <cStringIO.StringI object at 0x2f145d0>, 'SERVER_PROTOCOL': 'HTTP/1.1', 'HTTPS': 'off', 'USER_IS_ADMIN': '0', 'TZ': 'UTC', 'REMOTE_ADDR': '192.168.0.2', 'HTTP_X_APPENGINE_COUNTRY': 'ZZ', 'HTTP_USER_AGENT': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.110 Safari/537.36', 'SERVER_SOFTWARE': 'Development/2.0', 'HTTP_CACHE_CONTROL': 'max-age=0', 'DEFAULT_VERSION_HOSTNAME': 'mydesktop:8080', 'SERVER_PORT': '8080', 'wsgi.run_once': False, 'REQUEST_METHOD': 'GET', 'USER_ID': '', 'AUTH_DOMAIN': 'gmail.com', 'USER_NICKNAME': '', 'USER_ORGANIZATION': '', 'wsgi.multiprocess': True, 'INSTANCE_ID': '8a8e02e6efa8d195346ae0c90cfeafce8aa2', 'PATH_INFO': '/', 'HTTP_ACCEPT_LANGUAGE': 'en-US,en;q=0.8', 'HTTP_HOST': 'mydesktop:8080', 'wsgi.errors': <google.appengine.api.logservice.logservice.LogsBuffer object at 0x2f09c30>, 'APPLICATION_ID': 'dev~myapp', 'wsgi.multithread': True, 'CURRENT_VERSION_ID': 'version-1', 'SCRIPT_NAME': '', 'REQUEST_LOG_ID': '4eafbc91ca4ebd5fee53f19eeab2eb26d243d9ddc92b6b9bc0a063eabdc84cfff', 'wsgi.url_scheme': 'http'} </code></pre> <p>Hope that helps.</p>

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